[pierrem15]

About half the original atoms in the condensate seem to have vanished in that they are not seen in either the remnant or the expanding gas cloud.

I hope the spectra of radiation they are checking include the gamma and x-ray bandwidths, or they may get some very sick physicists. Or may be neutrons: what happens to the electrons in cases where their energy level is this low?

[SunkenCiv]

don't know. Theoretical absolute zero is the point at which all continuity breaks down, and they got very close to that. Still, where did it go? This was posted on a little forum I keep, but it's from a few years ago.